Clamp.



I PATENTED JUL Y28, 19'03Q P. J. HERBERT, DEGD.

.'J. 'ooUnTNnY'. EXBOUTRIX.

, CLAMP. APPLIUATION FILED DEC. 12. 1902.

N0 MODEL.

PETERS 00.. Pnoruunqa. WASNINUTON, D. c.

' UNITED STATES Patented July 28, 1903.

PATE T OFFICE.

FREDERICK J. HERBERT, OF CHICAGO, ILLINOIS; JULIA COURTNEY EXECUTRIX OF SAID FREDERICK J. HERBERT, DECEASED.

CLAM P.

SPECIFICATION forming part of Letters Patent No. 734,554, dated July 28, 1903. Application filed December 12, 1902. Serial No. 134,924. (No model.)

To all whom it may concern).-

Be it known that I, FREDERICK J. HERBERT, a citizen of the United States of America, and a resident of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Clamps, of which the following is a specification.

The main objects of my invention are to provide an improved comparatively inexpensive form of self-locking clamp having considerable range of adjustability and being particularly adapted for use by molders for securing together the parts of a found ry-flask, to provide a clamp for this purpose which will occupy but little space along the sides of such flask, and to make the parts of suitable form to be cast complete and readily assembled without machine-work. I accomplish these objects by the device shown in the accompanying drawings, in which Figure 1 is a front elevation of a molders clamp constructed according to my invention. Fig. 2 is a side elevation of the same, partly in section. Fig. 3 is a rear elevation of the member 1. Fig. 4 is a side elevation, partly broken away, of the lower end of the shank 2. Fig. 5 is a section on the line V V of Fig. 2.

In the construction shown the shank 2 is provided on its front face with a series of rack-teeth 3 and has at one end a rearwardlyextending clamp-jaw 4:. A second shank 5 .extends along the shank 2 and is provided at the end which is farthest from the jaw 4 with a corresponding clamp jaw 6. The inner end of the shank 5, being the end which is nearest to the jaw 4:, is provided with a sleeve 7, which encircles the shank 2 and slidably secures the shanks 2 and 5 together. The sleeve 7 is preferably integral with the shank 5. The shank 5 has a groove 8 extending longitudinally along the front face of same and coacting with a lug 9 on the rear face of the shank 2, near the end 10 o'f same; The sleeve 7, together with the lug 9 and the groove 8, serves to maintain the alinement of the shanks 2 and 5, while permitting a telescoping movement of said shanks.

A member 1, having a spiral thread 11 on its rear face, is journaled on the sleeve 7 on a shaft 12, which is disposed at an angle with the length ofthe shanks. The memher 1 is preferably secured on the shaft 12 by means of the washer 13 and pin 14. The front part of the member 1 is preferably made in the form of a prismatic head 15, upon which is mounted a wrench or handle 16, having a corresponding prismatic aperture and being readily removable from said head. The spiral thread 11 is of suitable form to mesh with the rack-teeth 3 and cause a relative longitudinal movement between the shanks 2 and 5 when the member 1 is turned by means of the handle 16. The front face of the sleeve 7 is suitably cut away at 17 to permit the meshing of the spiral l1 and the rack-teeth 3 at a point intermediate of the ends of the sleeve 7. The groove 8 extends throughout the entire length of the shank 5, and the aperture which extendsthrough the sleeve 7 and receives the shank 2 is of uniform cross sectional area throughout its length, thus permitting the shanks 2 and 5 to be readily drawn apart and separated endwise. The shank 2 is T-shaped in cross-section, and the shank 5 is of channel-shaped cross-section, both being forms combining great strength with lightness. The sleeve 7 is of such form that it will engage the side flanges 18 of the shank 2 in suitable manner to prevent the rack-teeth on the Web 19 of the shank 2 from coming into contact with the sleeve and interfering with the free sliding of the shank 2 through said sleeve.

The operation of the device shown is as follows: When it is desired to secure the clamp to a piece of work, the handle 16 is placed upon the prismatic head of the member 1 and said member is rotated in the proper direction until the clamp-jaws 4 and 6'securely grasp the work. The rotation of the member 1 in the reversed direction will release the clamp. The spiral is of suitable curvature to make the device self-locking in any position. The handle 16 is readily removable from the member 1, and thus avoids the possibility of being struck during the handling of the work, and thereby tending to release the grasp of the jaws. The removability of the handle also avoids the objection of having projecting parts which are likely to engage the clothing of the workmen during the handling of the work.

to secure by Letters Patent, ishaving its outer face formed with a head A clamp comprising two shanks slidably adapted to be engaged by a Wrench, and. its 15 mounted, one on the other, one of said shanks inner face formed with a spiral to engage the 5 having its outer face formed with rack-teeth, teeth of said shank.

What I claim as my invention, and desire I out portion of the sleeve, and said member l a sleeve formed integral with the other shank I Signed at Chicago this 10th day of Decemand encircling the first-named shank, said her, 1902.

sleeve havin its front face formed with a a 1 1 1 w H cut-out porti n, an angularly-disposed shaft FREDERICK HhRbERl' 10 mounted on said sleeve adjacent the cut-out Witnesses:

'portion, and a member rotatably mounted on BLANCHE MICHAEL,

said shaft, projecting through the said out- 1 EUGENE A. RUMMLER. 

